falso
/
perfect_dark
mirror of https://github.com/n64decomp/perfect_dark.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Decompile __osSumCalc

This commit is contained in:
Ryan Dwyer 2021-03-25 07:55:36 +10:00
parent b083a94d3c
commit db632dc4cf
2 changed files with 19 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/include/lib/lib_4c090.h
View File

@ -4,7 +4,7 @@
#include "data.h"
#include "types.h"
u32 func0004c090(void);
u16 __osSumCalc(u8 *ptr, int length);
s32 __osIdCheckSum(u16 *ptr, u16 *csum, u16 *icsum);
s32 __osRepairPackId(OSPfs *pfs, __OSPackId *badid, __OSPackId *newid);
s32 __osCheckPackId(OSPfs *pfs, __OSPackId *temp);

57
src/lib/lib_4c090.c
View File

@ -76,42 +76,21 @@ u32 var8009c96c;
u32 var80060980 = 0xffffffff;
u8 var80060984 = 0xfa;
GLOBAL_ASM(
glabel func0004c090
/* 4c090: 00001825 */ or $v1,$zero,$zero
/* 4c094: 00801025 */ or $v0,$a0,$zero
/* 4c098: 18a00016 */ blez $a1,.L0004c0f4
/* 4c09c: 00003025 */ or $a2,$zero,$zero
/* 4c0a0: 30a70003 */ andi $a3,$a1,0x3
/* 4c0a4: 10e00008 */ beqz $a3,.L0004c0c8
/* 4c0a8: 00e02025 */ or $a0,$a3,$zero
.L0004c0ac:
/* 4c0ac: 904e0000 */ lbu $t6,0x0($v0)
/* 4c0b0: 24c60001 */ addiu $a2,$a2,0x1
/* 4c0b4: 24420001 */ addiu $v0,$v0,0x1
/* 4c0b8: 1486fffc */ bne $a0,$a2,.L0004c0ac
/* 4c0bc: 006e1821 */ addu $v1,$v1,$t6
/* 4c0c0: 50c5000d */ beql $a2,$a1,.L0004c0f8
/* 4c0c4: 00601025 */ or $v0,$v1,$zero
.L0004c0c8:
/* 4c0c8: 904f0000 */ lbu $t7,0x0($v0)
/* 4c0cc: 90580001 */ lbu $t8,0x1($v0)
/* 4c0d0: 90590002 */ lbu $t9,0x2($v0)
/* 4c0d4: 006f1821 */ addu $v1,$v1,$t7
/* 4c0d8: 90480003 */ lbu $t0,0x3($v0)
/* 4c0dc: 00781821 */ addu $v1,$v1,$t8
/* 4c0e0: 24c60004 */ addiu $a2,$a2,0x4
/* 4c0e4: 00791821 */ addu $v1,$v1,$t9
/* 4c0e8: 24420004 */ addiu $v0,$v0,0x4
/* 4c0ec: 14c5fff6 */ bne $a2,$a1,.L0004c0c8
/* 4c0f0: 00681821 */ addu $v1,$v1,$t0
.L0004c0f4:
/* 4c0f4: 00601025 */ or $v0,$v1,$zero
.L0004c0f8:
/* 4c0f8: 3049ffff */ andi $t1,$v0,0xffff
/* 4c0fc: 03e00008 */ jr $ra
/* 4c100: 01201025 */ or $v0,$t1,$zero
);
u16 __osSumCalc(u8 *ptr, int length)
{
int i;
u32 sum;
u8 *tmp;
sum = 0;
tmp = ptr;
for (i = 0; i < length; i++) {
sum += *tmp++;
}
return sum & 0xffff;
}
s32 __osIdCheckSum(u16 *ptr, u16 *csum, u16 *icsum)
{
@ -760,7 +739,7 @@ glabel func0004c934
/* 4ca08: 000d7040 */ sll $t6,$t5,0x1
/* 4ca0c: 25e50100 */ addiu $a1,$t7,0x100
/* 4ca10: afa3003c */ sw $v1,0x3c($sp)
/* 4ca14: 0c013024 */ jal func0004c090
/* 4ca14: 0c013024 */ jal __osSumCalc
/* 4ca18: 018e2021 */ addu $a0,$t4,$t6
/* 4ca1c: 8fb8005c */ lw $t8,0x5c($sp)
/* 4ca20: 8fa3003c */ lw $v1,0x3c($sp)
@ -822,7 +801,7 @@ glabel func0004c934
/* 4caec: 25250100 */ addiu $a1,$t1,0x100
/* 4caf0: 0308a021 */ addu $s4,$t8,$t0
/* 4caf4: 02802025 */ or $a0,$s4,$zero
/* 4caf8: 0c013024 */ jal func0004c090
/* 4caf8: 0c013024 */ jal __osSumCalc
/* 4cafc: afa5003c */ sw $a1,0x3c($sp)
/* 4cb00: 8fab005c */ lw $t3,0x5c($sp)
/* 4cb04: 304a00ff */ andi $t2,$v0,0xff
@ -846,7 +825,7 @@ glabel func0004c934
/* 4cb48: 1420fff4 */ bnez $at,.L0004cb1c
/* 4cb4c: 26310020 */ addiu $s1,$s1,0x20
/* 4cb50: 02802025 */ or $a0,$s4,$zero
/* 4cb54: 0c013024 */ jal func0004c090
/* 4cb54: 0c013024 */ jal __osSumCalc
/* 4cb58: 8fa5003c */ lw $a1,0x3c($sp)
/* 4cb5c: 8fa8005c */ lw $t0,0x5c($sp)
/* 4cb60: 305800ff */ andi $t8,$v0,0xff